RT Journal Article SR Electronic T1 Stock-Market Risk Factors and Manager Performance JF The Journal of Portfolio Management FD Institutional Investor Journals SP 40 OP 48 DO 10.3905/jpm.2022.1.348 VO 48 IS 5 A1 Peter Mladina A1 Steven Germani YR 2022 UL https://pm-research.com/content/48/5/40.abstract AB There has been a proliferation of stock-market factors that have been mined from historical data, and researchers are now using different methods to address this factor zoo. The authors employ a new method of jointly testing stock-market factor models and manager performance using the attributes of market efficiency as an ideal, or benchmark. They find that a modified three-factor model with an intertemporal risk-free asset is the best factor model overall for traded stock portfolios. Evidence for a simple intertemporal CAPM is also encouraging. Consistent with prior research, they find little evidence of manager skill net of expenses.